Insulating-arm



No. M2062. Patented Jan. 3, |899. J. n. TALlAFEnRo.

INSULATIN` ARM.

(Application fled June 18, 1898.1

(No Model.)

Wa'n/esses l 70' rm: mms ams co. moromwo., msnmsvow u c UNITED STATESPATENT EEICE.

.IOHN D. TALIAFERRO, OF LOUDON, TENNESSEE.

INSULATING-ARIVI.

SPECIFICATION forming part of Letters Patent No. 617,062, dated January3, 1899.

Application tiled June 18,1898. Serial No. 6.83,837. (No model.)

To (LZ/Z whom it may concern:

Be it knownthat I, JOHN D. TALIAEEREO, a citizen of the United States,residing at Loudon, in the county of Loudon and State of Tennessee, haveinvented certain new and useful Improvements in Insulating-Arms; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the saine.

This invention relates to insulating-sup ports for electric conductors;and the object is 4to provide an improved construction of arm adaptedfor use on telegraph-poles or in other locations, which arm will notonly be equipped with wire -holding insulators at suitable distancesapart, but will also provide for insulation in the event of the Wiresbecoming` displaced from suoli insulation.

To this end the invention consists in certain novel features ofconstruction and combinations of parts recited in the appended claimsand preferred forms ot' embodiment of which are shown in theaccompanying drawings, forming part of this specification.

Ot said drawings, Figure 1 represents a cross-arm constructed inaccordance with my invention and applied to a telegraph-pole. Fig. 2represents in longitudinal section, on an enlarged scale, that portionof the crossarm on one side of the pole, together with a portion of thepole. Figs. 3 and 4 are crosssections taken on lines III III and IV IVof Fig. 2. illustrating a modiiication.

In the accompanying drawings the reference-letter a designates a roundmetal rod which forms the core of the arin and which may occupya holemade transversely through the telegrapli-pole as shown in Fig. 2, or itmay have a flattened central portion a', as shown in Fig. 5, boltedagainst one side of the pole, or it may be suited in some other way torattachment to an appropriate support.

.Vhere the arm is for application to a telegraph-pole, it is made toextend on both sides of the same, and the rod is screw-threaded at eachend, as shown at a2, to receive nuts b, for a purpose hereinafterexplained.

Insulators are strung along the rod, and

Fig. 5 is a view similar to Fig. 1,

each insulator comprises a glass annulus c, circumferentially grooved,as shown at c', and beveled on each side of the grooves, and a bushingd, ot wood or other suitable mate rial, exteriorly screw threaded toengage screw-threads in the bore of the glass annu lus. These insulatorsare spaced apart and kept separate by means of glass sleeves e embracingthe rod7 and similar sleeves c surn round the rod between thetelegraph-pole an d the insulators nearest thereto. The nuts Z) appliedto the ends of the rod bear against the outermost insulators and clampall the insulators and sleeves together. The wires are engaged with thegrooves ot the insulators and tie-wires are employed in the ordinaryWay; but, as is well known, the tie-wires sometimes work loose and allowthe electric conducting-wires to slip from their places. With myconstruction the arm is completely insulated and displacement of thewires cannot result disastrously, for the spacingsleeves c and c' are otinsulating material and will afford a bearing-surface for the wires inthe event of their disengagement from the grooves ot the insulators.

The compactness and practicability ot the entire structure here shownwill be noted and the fact that it is susceptible of ready adaptation todiilierent needs.

While I have mentioned glass as the material of which the spacingsleevesand grooved insulating-annuli are composed, it is to be understood thatother insulating material may be used. Moreover, the invention may beembodied in structures differing more orless from those shown in theaccompanying drawings without involving a departure from the spirit andscope of the invention.

The grooved insulators may be made with out wooden bushings, and the armmay be braced by a bracket-piece underneath if found preferable tomaking the center rod large enough to dispense with any such additionalVsupport.

In Ficb 5 washers of vulcanized rubber, are shown interposed between thesleeves and the insulators, and similar washers may be introducedbetween the post and sleeves, and one may well be interposed between theclampingnnnt and the end insulator, especially where the latter has nowooden bush-V ing. rlhe short sleeves fo (shown in Fig. 5) between theinnermost insulators and the ilattened portion of t-he rod may beadvantageouslymade of vulcanized rubber the same as the washers a'.

Having thus fully described my invention, what I Claim as new, anddesire to secure by Letters Patent of the United States, is-

l. An insulating-arm eornprisinga horizontal supporting rod or eore ofmetal, annular insulators strung upon the saine and having encirclingwire holding grooves, spacingsleeves of insulating material surroundingthe rod between said annular insulators, and means for holding latterand the sleeves together on the rod.

2. An insulating-arm comprising a metal supporting rod or eore, annularinsulators strung upon said rod and having wooden bushings, andspacing-sleeves of insulating material covering the rod between saidannular insulators.

3. An insulating cross-arm for telegraphpoles, comprising a metal rodfor engagement with the pole, sleeves of insulating material strungalong said rod, annular insulators applied to the latter between thesleeves, and means for Clam ping the sleeves and insulators together oneach side of the pole.

Ll. The combination of a pole having a transverse opening through it, ametal rod passing through said opening and having screwthreads at itsends, insulators strung upon said rod, spacing-sleeves of insulatingmaterial covering the rod between the insulators and between theinnermost ones of the latter and the pole, and nuts applied to the endsof the rod and clamping the sleeves and insulators together.

In testimony whereof I aiiix my signature in presence of two witnesses.

IOIIN D. TALIAFERRO.

Titnesses S. H. HENDERSON, A. S. HENDERSON.

